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Rewrite Caller
Overview
This example provides a minimal function call chain - main() → outer() → inner() - designed as a test target for binary rewrite instrumentation. The functions are marked noinline to ensure they appear as distinct entries in the call graph after instrumentation. By counting the total calls through the chain, you can verify that binary rewriting correctly intercepts and records every function entry and exit. This is useful for validating instrumentation overhead and call graph accuracy.
Source Files
rewrite-caller.cpp- Definesinner()(increments a counter),outer()(callsinner()), andmain()(callsouter()N times).
Prerequisites
- CMake 3.25+
- C++ compiler
Building
Standalone build:
cmake -B <build_dir> -S <project_root>/examples/rewrite-caller
cmake --build <build_dir>
As part of the examples suite:
cmake -B <build_dir> -S <project_root>/examples/
cmake --build <build_dir> --target rewrite-caller
NOTE: The target is built in Debug mode to preserve the full call chain.
Running
# Default: 10 calls
./rewrite-caller
# Custom: 1000 calls
./rewrite-caller 1000
Arguments:
| Position | Description | Default |
|---|---|---|
| 1 | Number of calls to outer() | 10 |
Profiling with rocprofiler-systems
This example is best used with binary rewrite instrumentation:
# Rewrite the binary
rocprof-sys-instrument -o rewrite-caller.inst -- ./rewrite-caller
# Run the instrumented binary
./rewrite-caller.inst 100
For runtime instrumentation:
rocprof-sys-instrument -- ./rewrite-caller 100
Recommended Configuration
| Variable | Value | Purpose |
|---|---|---|
ROCPROFSYS_TRACE |
true |
Generate Perfetto trace showing call chain |
ROCPROFSYS_PROFILE |
true |
Generate call-stack profile with call counts |
ROCPROFSYS_USE_SAMPLING |
ON |
Enable sampling alongside instrumentation |